On a write-once-type recording medium 10, there are provided: a definite defect management area 13 to definitely record therein defect management information; and a plurality of temporary defect management areas 14A, 14B, and 14C to temporarily record therein the defect management information. The method includes accepting the entered URL, parsing the accepted URL into URL parts, and carrying out a conventional URL lookup. A constant output light source is located at one end of the optical fiber and a multicell photoarray is placed adjacent the free end of the fiber so that movement of the fiber due to acceleration can be readily detected. Based on the relationship of the reflecting system and the pattern generator, the illumination beam is telecentric proximate the object plane and the patterned illumination beam is telecentric proximate the image plane. Each actuator element extends within a tubular housing and either the tubular housing is axially rotated about the actuator element or the actuator element is axially rotated within the tubular housing to reduce at least one force opposing an axial force exerted through or movement of the actuator element. The operational recommendations are used to optimize the objective function, mitigate dysfunctions, and improve drilling efficiency.